fix(amazon-cognito-identity-js): undefined params in sendMFASelectionAnswer callbacks

[codynguyen]

Issue #, if available:

Description of changes:

This fixes a bug with sendMFASelectionAnswer returning undefined parameters in its callbacks:

cognitoUser.sendMFASelectionAnswer(mfaType, {
  mfaRequired: function(challengeName, challengeParameters) {
    console.log(challengeName, challengeParameters); // both undefined
  },
  totpRequired: function(challengeName, challengeParameters) {
    console.log(challengeName, challengeParameters); // both undefined too
  },
})

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[amhinson]

Thanks for the PR @codynguyen! However, this appears to be a duplicate of #6418, so we'll focus on that one for now.

[github-actions]

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